Thus, from this limited examination of phosphate metabolism after traumatic injury, we see from the study of burns that pediatric patients suffer significant but transient hypophosphatemia with a more lasting hypomagnesemia, the latter likely because of upregulation of the parathyroid CaSR and fluid resuscitation with Mg‐free Ringer's Lactate solution. The gene discussed is CASR; the disease is Hypomagnesemia.